retral ertral rteral treral etrral terral rertal errtal rretal rretal errtal rertal rtreal trreal rrteal rrteal trreal rtreal etrral terral ertral retral treral rteral retarl ertarl rtearl trearl etrarl terarl reatrl eratrl raetrl aretrl eartrl aertrl rtaerl traerl raterl arterl tarerl atrerl etarrl tearrl eatrrl aetrrl taerrl aterrl reratl erratl rreatl rreatl erratl reratl reartl erartl raertl arertl earrtl aerrtl rraetl rraetl raretl arretl raretl arretl erartl reartl earrtl aerrtl raertl arertl rtrael trrael rrtael rrtael trrael rtrael rtarel trarel ratrel artrel tarrel atrrel rratel rratel rartel arrtel rartel arrtel trarel rtarel tarrel atrrel ratrel artrel etrarl terarl ertarl retarl trearl rtearl etarrl tearrl eatrrl aetrrl taerrl aterrl eratrl reatrl eartrl aertrl raetrl aretrl traerl rtaerl tarerl atrerl raterl arterl retrla ertrla rterla trerla etrrla terrla rertla errtla rretla rretla errtla rertla rtrela trrela rrtela rrtela trrela rtrela etrrla terrla ertrla retrla trerla rterla retlra ertlra rtelra trelra etrlra terlra reltra erltra rletra lretra elrtra lertra rtlera trlera rltera lrtera tlrera ltrera etlrra telrra eltrra letrra tlerra lterra rerlta errlta rrelta rrelta errlta rerlta relrta erlrta rlerta lrerta elrrta lerrta rrleta rrleta rlreta lrreta rlreta lrreta erlrta relrta elrrta lerrta rlerta lrerta rtrlea trrlea rrtlea rrtlea trrlea rtrlea rtlrea trlrea rltrea lrtrea tlrrea ltrrea rrltea rrltea rlrtea lrrtea rlrtea lrrtea trlrea rtlrea tlrrea ltrrea rltrea lrtrea etrlra terlra ertlra retlra trelra rtelra etlrra telrra eltrra letrra tlerra lterra erltra reltra elrtra lertra rletra lretra trlera rtlera tlrera ltrera rltera lrtera retalr ertalr rtealr trealr etralr teralr reatlr eratlr raetlr aretlr eartlr aertlr rtaelr traelr ratelr artelr tarelr atrelr etarlr tearlr eatrlr aetrlr taerlr aterlr retlar ertlar rtelar trelar etrlar terlar reltar erltar rletar lretar elrtar lertar rtlear trlear rltear lrtear tlrear ltrear etlrar telrar eltrar letrar tlerar lterar realtr eraltr raeltr areltr earltr aerltr relatr erlatr rleatr lreatr elratr leratr raletr arletr rlaetr lraetr alretr laretr ealrtr aelrtr elartr leartr alertr laertr rtaler traler ratler artler tarler atrler rtlaer trlaer rltaer lrtaer tlraer ltraer ralter arlter rlater lrater alrter larter talrer atlrer tlarer ltarer altrer latrer etalrr tealrr eatlrr aetlrr taelrr atelrr etlarr telarr eltarr letarr tlearr ltearr ealtrr aeltrr elatrr leatrr aletrr laetrr talerr atlerr tlaerr ltaerr alterr laterr reralt erralt rrealt rrealt erralt reralt rearlt erarlt raerlt arerlt earrlt aerrlt rraelt rraelt rarelt arrelt rarelt arrelt erarlt rearlt earrlt aerrlt raerlt arerlt rerlat errlat rrelat rrelat errlat rerlat relrat erlrat rlerat lrerat elrrat lerrat rrleat rrleat rlreat lrreat rlreat lrreat erlrat relrat elrrat lerrat rlerat lrerat realrt eralrt raelrt arelrt earlrt aerlrt relart erlart rleart lreart elrart lerart ralert arlert rlaert lraert alrert larert ealrrt aelrrt elarrt learrt alerrt laerrt rralet rralet rarlet arrlet rarlet arrlet rrlaet rrlaet rlraet lrraet rlraet lrraet ralret arlret rlaret lraret alrret larret ralret arlret rlaret lraret alrret larret eralrt realrt earlrt aerlrt raelrt arelrt erlart relart elrart lerart rleart lreart ealrrt aelrrt elarrt learrt alerrt laerrt ralert arlert rlaert lraert alrert larert rtrale trrale rrtale rrtale trrale rtrale rtarle trarle ratrle artrle tarrle atrrle rratle rratle rartle arrtle rartle arrtle trarle rtarle tarrle atrrle ratrle artrle rtrlae trrlae rrtlae rrtlae trrlae rtrlae rtlrae trlrae rltrae lrtrae tlrrae ltrrae rrltae rrltae rlrtae lrrtae rlrtae lrrtae trlrae rtlrae tlrrae ltrrae rltrae lrtrae rtalre tralre ratlre artlre tarlre atrlre rtlare trlare rltare lrtare tlrare ltrare raltre arltre rlatre lratre alrtre lartre talrre atlrre tlarre ltarre altrre latrre rralte rralte rarlte arrlte rarlte arrlte rrlate rrlate rlrate lrrate rlrate lrrate ralrte arlrte rlarte lrarte alrrte larrte ralrte arlrte rlarte lrarte alrrte larrte tralre rtalre tarlre atrlre ratlre artlre trlare rtlare tlrare ltrare rltare lrtare talrre atlrre tlarre ltarre altrre latrre raltre arltre rlatre lratre alrtre lartre etralr teralr ertalr retalr trealr rtealr etarlr tearlr eatrlr aetrlr taerlr aterlr eratlr reatlr eartlr aertlr raetlr aretlr traelr rtaelr tarelr atrelr ratelr artelr etrlar terlar ertlar retlar trelar rtelar etlrar telrar eltrar letrar tlerar lterar erltar reltar elrtar lertar rletar lretar trlear rtlear tlrear ltrear rltear lrtear etalrr tealrr eatlrr aetlrr taelrr atelrr etlarr telarr eltarr letarr tlearr ltearr ealtrr aeltrr elatrr leatrr aletrr laetrr talerr atlerr tlaerr ltaerr alterr laterr eraltr realtr earltr aerltr raeltr areltr erlatr relatr elratr leratr rleatr lreatr ealrtr aelrtr elartr leartr alertr laertr raletr arletr rlaetr lraetr alretr laretr traler rtaler tarler atrler ratler artler trlaer rtlaer tlraer ltraer rltaer lrtaer talrer atlrer tlarer ltarer altrer latrer ralter arlter rlater lrater alrter larter
Note: these 'words' (valid or invalid) are all the permutations of the word retral. These words are obtained by scrambling the letters in retral.